© 1996 American Heart Association, Inc.
Articles |
Shear Stress Modulates Expression of Cu/Zn Superoxide Dismutase in Human Aortic Endothelial Cells
the Department of Medicine (N.I., S.R., T.F., D.G.H.), Emory University School of Medicine; Veterans Administration Hospital (D.G.H.); and the Biomechanics Laboratory (R.M.N.), School of Mechanical Engineering, Georgia Institute of Technology, Atlanta.
Correspondence to David G. Harrison, Professor of Medicine, Cardiology Division, Emory University School of Medicine, Atlanta, GA 30322. E-mail dharr02@emory.edu.
A major determinant of the level of cellular superoxide anion (O2-
) is the dismutation of O2- to hydrogen peroxide by the enzyme superoxide dismutase (SOD). Three forms of SOD exist, but in endothelial cells, the major form outside of the mitochondria is the cytosolic copper/zinc-containing superoxide dismutase (Cu/Zn SOD). Since fluid shear stress is an important determinant of the function and structure of endothelial cells in vivo, we examined the effect of laminar shear stress on the expression of Cu/Zn SOD in cultured human aortic endothelial cells. Laminar shear stress of 0.6 to 15 dyne/cm2 increased Cu/Zn SOD mRNA in a time- and dose-dependent manner in human aortic endothelial cells. Shear stress also increased both Cu/Zn SOD protein content and the enzyme activity. Nuclear run-on assays showed that nuclei from human aortic endothelial cells exposed to laminar shear stress had a 1.6-fold greater transcriptional activity of the Cu/Zn SOD gene compared with cells not exposed to shear, indicating that an increase in Cu/Zn SOD mRNA induced by laminar shear stress is at least in part mediated by increased transcription. In contrast, shear stress had no effect on Cu/Zn SOD mRNA levels in human aortic smooth muscle cells. These findings show that physiological levels of shear stress increase expression of Cu/Zn SOD in the endothelium. This adaptation to shear stress might augment the effect of locally produced NO and thereby promote the antiatherogenic and anti-inflammatory properties of the endothelial cell.
Key Words: superoxide • shear stress • superoxide dismutase • hemodynamics • endothelium
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